Comment 12 for bug 173861

Adding onto severity of this situation:
Korean blogosphere is almost overloaded with warning messages telling readers:
"Do NOT update libcairo2!"

The majority of Korean users use Gulim.ttc and Batang.ttc, since using ones supplied with Ubuntu (Baekmuk) isn't so great with anti-aliasing.
This update rendered, probably thousands of users' computers unusable.
Some linux-savvy users would have figured it out that it was the font problem by checking logs etc,
but new users just can't do anything about it, and is left with absolutely no applications running
(all of them that use cairo is crashing with floating point exception whenever applicable font is used in application)

This "looks" like Firefox is the problem, but you have to realize that many Asian users use English version of OS, and only time they encounter their language is in a web browser, so that's why so many bugs are filed about Firefox crashing.